Lettuce big-vein disease

Lettuce big-vein disease is a plant disease that primarily affects lettuce crops. It is caused by the Lettuce big-vein associated virus (LBVaV) and the Mirafiori lettuce big-vein virus (MLBVV). The disease is characterized by the appearance of large, clear veins on the leaves of the lettuce plant.

Symptoms

The most common symptom of lettuce big-vein disease is the appearance of enlarged, clear veins on the leaves of the lettuce plant. These veins may be accompanied by a yellowing of the leaf tissue, known as chlorosis. In severe cases, the disease can cause the lettuce plant to become stunted and deformed.

Causes

Lettuce big-vein disease is caused by two viruses: the Lettuce big-vein associated virus (LBVaV) and the Mirafiori lettuce big-vein virus (MLBVV). These viruses are transmitted by the soil-borne fungus Olpidium brassicae, which infects the roots of the lettuce plant.

Management

Management of lettuce big-vein disease involves a combination of cultural practices and chemical treatments. Cultural practices include crop rotation and the use of resistant lettuce varieties. Chemical treatments include the use of fungicides to control the Olpidium brassicae fungus.

See also

• Plant pathology
• Viral diseases of plants
• Lettuce

References

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